For inoculation, we used a
population of S. endobioticum that was determined on 19 potato differentials to be pathotype 1. For resistance tests, we used samples of
three populations S. endobioticum from the Moscow Region of Russia Belarus and Ukraine. These samples were propagated on susceptible
potato cultivars Liza and Lorkh by inoculation of potato sprouts in
compost, keeping winter zoosporangia of S. endobioticum. For inoculum